Have you ever booked a reward flight on UA, had the receipt emailed, the seats assigned but none of the miles removed from your account? This happened to my parents about a month ago and the miles have still not been taken out of their account. Does this ever happen? Will the miles be taken out eventually? Will United cancel their reservation at the last minute? I just would like to know if I should call and address the problem or if I should just shut up and let them get a reward for free. Thoughts?